Again, Christian, well done. You are capturing some tone differences in the QE zone. Also, love the way your portray the GRS being darker along the southern edge. The notch in the NEB is interesting, too.

Seems a 10" can do those ovals in the STrB. They are extremely elusive in a 6", a holey grail for me.

But, detail can surely be seen on Ganymede's tiny disc. Placing it correctly can be a challenge, too. Great observation, I never even thought it was possible until Pete mentioned trying it.